1 Vltava

2 Agra, India

3 Hindu

4 It's the kneecap

5 A snare drum used in the military

6 The Vatican State is in Rome

7 Here are some of his book titles:

 

8 Der Hund, zwölf, Mutter, Tisch, Hund.

9 George Washington was the first president under their new constitution

10 1732

11 Leopard-like cat

12 Main types are cumulus, stratus, cirrus, nimbus

13 Ulm, in Germany

14 Lake Baikal, Siberia, Russia

15 Marsupials (Macropods also acceptable)

16 Sydney Opera House, Australia

17 Concorde

18 Barometer

19 Archaeopterix

20 Séadanta (Setanta)

21 Muhammad Ali

22 Finland, Lithuania, Slovakia

23 Go against, break law

24 Sand, silicon, limestone

25 Islam